J-Pipes vs 4x4 Headers with Coyote Engine

[Jazzman]

What are the advantages/disadvantages of the J-Pipes vs. the 4x4 Headers when used with the Coyote 5.0 Engine? If it makes any difference, I plan to mate the engine to a Tremec TKO-600 and the 2015 Mustang GT IRS with 3.55 final drive ratio. I also want to use the stainless steel side pipes, but I want to add the Breeze Automotive Quiet pipes options with the slightly turned down ports. As always, Thank you for your insight.

[Al_C]

Looking at my order documents, I don't think there was really a choice. You need the coyote straight tubes (15442) and the coyote headers with fasteners (33920). I'm sure someone who's completed a build will chime in, but this combination is what FFR recommended.

[edwardb]

If you're going with the standard FFR setup for the Coyote, the referenced parts are correct. They work. Many though are going to an aftermarket header from http://stainlessheaders.eclipticcms.com/coyote. A little pricier, but by all accounts a better solution. The work is now being done by a company called GP Headers, but still the same product. I understand they are also available through Mike Forte, a forum vendor. I can't cite specific HP differences, but this pure straight tube approach is more efficient than a J-pipe setup. I'm planning to use these headers on my 20th Anniversary Roadster build.

[jceckard]

For those of us who want and/or need to run cats, is the only option still to get the J pipes and have them modified? Does anyone offer or does anyone plan to offer a cat option for the coyote?

[bwwooster]

If running 4-into-4s prevents you from adding a crossover pipe, I'd think twice about running them. I couldn't drive my car for any appreciable distance without it causing pain in my left ear before I added the crossover (connecting the left and right side exhausts).

[Mesa Mike]

Started with J pipes and had a crossover made for it. Great exhaust note but the 4X4 provides more HP.

[edwardb]

I couldn't drive my car for any appreciable distance without it causing pain in my left ear before I added the crossover (connecting the left and right side exhausts).

IMO you should wear ear plugs while driving these cars, no matter what exhaust setup.

[walt mckenna]

An earlier reply mentioned Catalytic Converters. You may want to think about that possibility even if your state (or your wife) don't require them. They eliminate the pre-catalytic converter exhaust smell of the 60's and quiet the exhaust considerably with no noticeable difference in seat-of-the-pants feel as far as power. From the dyno runs I have seen on the Coyote, any reduction in horsepower would just mean you are less out of control.

[BEAR-AvHistory]

Am using the FFR J-Pipes & so far so good. Engine is very strong with just a tune. Main thing is bad guy soubd with the throttle down but can steady cruise in 5th & it runs surprisingly quiet. Idle is also quiet unless you run the 427 solid lifter cam mod to the tune.